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C. C. POLYSU.

METHOD AND APPARATUS ma cAs|A|G WELLS,

APPLICATION FILED MAYZ. 1918. RENEWED APR. 4| l9l9. 1 ,3 1 3,0 1 3 Patented Aug. 12, 1919.

UNITED STATES @Frm i coNs'rANrINE c. roLYv'sU, or` ToivN'EnE@narines,

METHODAND'APPARATUS FoRcAsING WELLS.-

speiification omettere Patent. i Patented Aug. 12,

Application ma May 2 5, ieisgsen'ai No. 2363535. Renewedf Aprn 4, .1919. seriar No. 287,636.

To allwhom z'tmay concern: .1. Be lit known that "I, CoNs'rAN'rINn C.

PoLYsU, a subject of the King of Rouinania,l

f residing at Tonnere, France, have invented a new and Improved Method and Apparatus for Casing Wells, of which the following is a full, clear, and exact description.

My invention relates to a novel method of casing wells and is characterized by they fact that the casing is .built as the boring proceeds, the casing being built up from the lower end.

An object of the invention is to provide a casing of uniform bore so as not to reduce the diameterof the well as the depth of same increases. g A

Another object of the invention is to provide a moldv which foll'o'wsthe v boring tool and-to which cement may be supplied to mold the Vcasing continuously as the of the well increases.

With the above and other objects in view, the nature of which will more fully appear as the description proceeds, the invention consists in the novel construction, combination and arrangement of parts as herein fully described, illustrated and claimed.

In the accompanying drawings, forming part of the application, similar characters of reference indicate corresponding parts in both views. Figure -l is a diagrammatic fragmentary section through a well provided with a casing built in accordance with my method; and

Fig. 2 is a cross section on line 2 2, Fig. 1.

In casing wells with steel tubing, it is necessary to start the well at a considerably larger diameter of bore than the one it is desirable to have when the well is nished, the reason being that the casing is built up from the top of the well as the boring progresses; and in view of the fact that the friction between the ground and the Vcasing increases with the depth, the time comes when the casing will not descend any further and, in consequence, a smaller casing has to be introduced so that the boring can be progressed with. Therefore, at great depths a large number of interengaging casings y Vaccumulates within the well with a considerdepth i which progresses with the depth of thewell'. bydbuilding the casing upl from the lower en.Y E x .Referring to vthe drawings, 3` is a well in. which a tubular mold 4 Visaprovided.. The mold 4 at the lower end has. ahead eextendfl ing laterally and the outer diameter-of which. is substantially equal to the diameter ,of the bore of the well. The outer diameter ofthe/1 pose to builda casing .of uniform diameterv mold' 4. is such that the width of the margin g.

of the head represents the ,thcknesszwhich' the casing 6 forthezzwelil is to'have. y The,

mold-4 has a` iplurality of tubular passages@` open at the upper endin theedgeof the mold. At the lower end the passagesI 7:0pen

laterally on to' the outer periphery of the l mold in proximity of the head 5. ,I .Y .1 The mold 4: is adapted to follow the boring tool 8, shownin dottedlineawhich '-of the `e'xpansible type so that the same can pass the mold and be yexpanded to the size of l the head 5 of the mold. It may be here re'- niarked that my method of casing is suitable for boring systems of the rotary and the impact type. As theboring proceeds the mold descends and the annular space formed about the mold in the wellV is filled by the cement supplied to the mold continuously under pressure by a pump 9. yIn consequence, the formation of the casing is continuous. A suitable conduit 10 extends from the top of the well to the passages 7. This conduit is increased in length as the depth of the well increases. The mold is continuously forced to follow the boring tool, for the pressure under which the cement is supplied about the mold reacts against the head of the mold, and since the only movable part is the mold, the same is caused to follow the boring tool. It is self-evident that the pressure under which the cement is supplied to the mold may be varied according to the resistance offered and tothe ground in which the work is carried on. The mold may be highly polished so as to reduce friction between the portion of the casing formed when in engagement with the mold, and the mold.

In cases where the formation of the casing is to be interrupted for some cause, it is necessary to prevent the cement from hardening in the passages of the mold, and for this purpose I provide an auxiliary passage 11 in the mold similar to the passages 7 but which is united with the passages 7 near the bottom of said passages by a circular passage 12, shown in dotted line. Water can be supplied to said passage 11 by a conduit 13 from a suitableppump, not shown, so as to drive out all the cement in the passages 7 and conduits leading thereto.

From the above description it will be seen that by my method the casing is built continuously from the lower end, the progress being continuous with the progress of the depth of the Well. Though the mold remains permanently in the well(` the boring Vtool can be extracted for exchange or repair, as the case may be. Means are provided for driving out the cement from the mold when the boring of the well is arrested for one cause or another.

While I have described the method and the apparatus which I consider to be the best embodiment thereof, I desire to have it understood that the method and apparatus shown are merely illustrative and that such changes may be made as are within the scope of the appended claims.

I claim: n

1. A method of casing wells, which consists in boring the well and forming the casing adjacently above. the boring tool as theJ tool descends.

2. A method of casing wells, which con sists in providing a mold adapted to follow the boring tool and supply cement continuously tothe mold as the boring proceeds whereby the casing is formed continuously by the mold above the boring tool.

3. A device for forming casing sections in a well, comprising a tubular form having a lateral head at the lower end, said tubular form having )assages opening in the upper edge of the mo d and also in the outer periphery Vin proximity of the head whereby molding material may be supplied about the mold through said passages.

4. A device for forming casing sections in the well, Vcomprising' a tubular form have ing a lateral head at the lower end, said tubular form having passages opening in the upper edge of the mold and also in the outer periphery in proximity to the head, and a passage opening in the upper edge and connected with the previously mentioned passages near the lower end of said passages.

CONSTANTINE C. POLYSU.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

